(function() {
// 此处写功能方法

	function date (format, timestamp) {
	  //  discuss at: http://locutus.io/php/date/
	  // original by: Carlos R. L. Rodrigues (http://www.jsfromhell.com)
	  // original by: gettimeofday
	  //    parts by: Peter-Paul Koch (http://www.quirksmode.org/js/beat.html)
	  // improved by: Kevin van Zonneveld (http://kvz.io)
	  // improved by: MeEtc (http://yass.meetcweb.com)
	  // improved by: Brad Touesnard
	  // improved by: Tim Wiel
	  // improved by: Bryan Elliott
	  // improved by: David Randall
	  // improved by: Theriault (https://github.com/Theriault)
	  // improved by: Theriault (https://github.com/Theriault)
	  // improved by: Brett Zamir (http://brett-zamir.me)
	  // improved by: Theriault (https://github.com/Theriault)
	  // improved by: Thomas Beaucourt (http://www.webapp.fr)
	  // improved by: JT
	  // improved by: Theriault (https://github.com/Theriault)
	  // improved by: Rafał Kukawski (http://blog.kukawski.pl)
	  // improved by: Theriault (https://github.com/Theriault)
	  //    input by: Brett Zamir (http://brett-zamir.me)
	  //    input by: majak
	  //    input by: Alex
	  //    input by: Martin
	  //    input by: Alex Wilson
	  //    input by: Haravikk
	  // bugfixed by: Kevin van Zonneveld (http://kvz.io)
	  // bugfixed by: majak
	  // bugfixed by: Kevin van Zonneveld (http://kvz.io)
	  // bugfixed by: Brett Zamir (http://brett-zamir.me)
	  // bugfixed by: omid (http://locutus.io/php/380:380#comment_137122)
	  // bugfixed by: Chris (http://www.devotis.nl/)
	  //      note 1: Uses global: locutus to store the default timezone
	  //      note 1: Although the function potentially allows timezone info
	  //      note 1: (see notes), it currently does not set
	  //      note 1: per a timezone specified by date_default_timezone_set(). Implementers might use
	  //      note 1: $locutus.currentTimezoneOffset and
	  //      note 1: $locutus.currentTimezoneDST set by that function
	  //      note 1: in order to adjust the dates in this function
	  //      note 1: (or our other date functions!) accordingly
	  //   example 1: date('H:m:s \\m \\i\\s \\m\\o\\n\\t\\h', 1062402400)
	  //   returns 1: '07:09:40 m is month'
	  //   example 2: date('F j, Y, g:i a', 1062462400)
	  //   returns 2: 'September 2, 2003, 12:26 am'
	  //   example 3: date('Y W o', 1062462400)
	  //   returns 3: '2003 36 2003'
	  //   example 4: var $x = date('Y m d', (new Date()).getTime() / 1000)
	  //   example 4: $x = $x + ''
	  //   example 4: var $result = $x.length // 2009 01 09
	  //   returns 4: 10
	  //   example 5: date('W', 1104534000)
	  //   returns 5: '52'
	  //   example 6: date('B t', 1104534000)
	  //   returns 6: '999 31'
	  //   example 7: date('W U', 1293750000.82); // 2010-12-31
	  //   returns 7: '52 1293750000'
	  //   example 8: date('W', 1293836400); // 2011-01-01
	  //   returns 8: '52'
	  //   example 9: date('W Y-m-d', 1293974054); // 2011-01-02
	  //   returns 9: '52 2011-01-02'
	  //        test: skip-1 skip-2 skip-5
	  var jsdate, f
	  // Keep this here (works, but for code commented-out below for file size reasons)
	  // var tal= [];
	  var txtWords = [
		'Sun', 'Mon', 'Tues', 'Wednes', 'Thurs', 'Fri', 'Satur',
		'January', 'February', 'March', 'April', 'May', 'June',
		'July', 'August', 'September', 'October', 'November', 'December'
	  ]
	  // trailing backslash -> (dropped)
	  // a backslash followed by any character (including backslash) -> the character
	  // empty string -> empty string
	  var formatChr = /\\?(.?)/gi
	  var formatChrCb = function (t, s) {
		return f[t] ? f[t]() : s
	  }
	  var _pad = function (n, c) {
		n = String(n)
		while (n.length < c) {
		  n = '0' + n
		}
		return n
	  }
	  f = {
		// Day
		d: function () {
		  // Day of month w/leading 0; 01..31
		  return _pad(f.j(), 2)
		},
		D: function () {
		  // Shorthand day name; Mon...Sun
		  return f.l()
			.slice(0, 3)
		},
		j: function () {
		  // Day of month; 1..31
		  return jsdate.getDate()
		},
		l: function () {
		  // Full day name; Monday...Sunday
		  return txtWords[f.w()] + 'day'
		},
		N: function () {
		  // ISO-8601 day of week; 1[Mon]..7[Sun]
		  return f.w() || 7
		},
		S: function () {
		  // Ordinal suffix for day of month; st, nd, rd, th
		  var j = f.j()
		  var i = j % 10
		  if (i <= 3 && parseInt((j % 100) / 10, 10) === 1) {
			i = 0
		  }
		  return ['st', 'nd', 'rd'][i - 1] || 'th'
		},
		w: function () {
		  // Day of week; 0[Sun]..6[Sat]
		  return jsdate.getDay()
		},
		z: function () {
		  // Day of year; 0..365
		  var a = new Date(f.Y(), f.n() - 1, f.j())
		  var b = new Date(f.Y(), 0, 1)
		  return Math.round((a - b) / 864e5)
		},
		// Week
		W: function () {
		  // ISO-8601 week number
		  var a = new Date(f.Y(), f.n() - 1, f.j() - f.N() + 3)
		  var b = new Date(a.getFullYear(), 0, 4)
		  return _pad(1 + Math.round((a - b) / 864e5 / 7), 2)
		},
		// Month
		F: function () {
		  // Full month name; January...December
		  return txtWords[6 + f.n()]
		},
		m: function () {
		  // Month w/leading 0; 01...12
		  return _pad(f.n(), 2)
		},
		M: function () {
		  // Shorthand month name; Jan...Dec
		  return f.F()
			.slice(0, 3)
		},
		n: function () {
		  // Month; 1...12
		  return jsdate.getMonth() + 1
		},
		t: function () {
		  // Days in month; 28...31
		  return (new Date(f.Y(), f.n(), 0))
			.getDate()
		},
		// Year
		L: function () {
		  // Is leap year?; 0 or 1
		  var j = f.Y()
		  return j % 4 === 0 & j % 100 !== 0 | j % 400 === 0
		},
		o: function () {
		  // ISO-8601 year
		  var n = f.n()
		  var W = f.W()
		  var Y = f.Y()
		  return Y + (n === 12 && W < 9 ? 1 : n === 1 && W > 9 ? -1 : 0)
		},
		Y: function () {
		  // Full year; e.g. 1980...2010
		  return jsdate.getFullYear()
		},
		y: function () {
		  // Last two digits of year; 00...99
		  return f.Y()
			.toString()
			.slice(-2)
		},
		// Time
		a: function () {
		  // am or pm
		  return jsdate.getHours() > 11 ? 'pm' : 'am'
		},
		A: function () {
		  // AM or PM
		  return f.a()
			.toUpperCase()
		},
		B: function () {
		  // Swatch Internet time; 000..999
		  var H = jsdate.getUTCHours() * 36e2
		  // Hours
		  var i = jsdate.getUTCMinutes() * 60
		  // Minutes
		  // Seconds
		  var s = jsdate.getUTCSeconds()
		  return _pad(Math.floor((H + i + s + 36e2) / 86.4) % 1e3, 3)
		},
		g: function () {
		  // 12-Hours; 1..12
		  return f.G() % 12 || 12
		},
		G: function () {
		  // 24-Hours; 0..23
		  return jsdate.getHours()
		},
		h: function () {
		  // 12-Hours w/leading 0; 01..12
		  return _pad(f.g(), 2)
		},
		H: function () {
		  // 24-Hours w/leading 0; 00..23
		  return _pad(f.G(), 2)
		},
		i: function () {
		  // Minutes w/leading 0; 00..59
		  return _pad(jsdate.getMinutes(), 2)
		},
		s: function () {
		  // Seconds w/leading 0; 00..59
		  return _pad(jsdate.getSeconds(), 2)
		},
		u: function () {
		  // Microseconds; 000000-999000
		  return _pad(jsdate.getMilliseconds() * 1000, 6)
		},
		// Timezone
		e: function () {
		  // Timezone identifier; e.g. Atlantic/Azores, ...
		  // The following works, but requires inclusion of the very large
		  // timezone_abbreviations_list() function.
		  /*              return that.date_default_timezone_get();
		   */
		  var msg = 'Not supported (see source code of date() for timezone on how to add support)'
		  throw new Error(msg)
		},
		I: function () {
		  // DST observed?; 0 or 1
		  // Compares Jan 1 minus Jan 1 UTC to Jul 1 minus Jul 1 UTC.
		  // If they are not equal, then DST is observed.
		  var a = new Date(f.Y(), 0)
		  // Jan 1
		  var c = Date.UTC(f.Y(), 0)
		  // Jan 1 UTC
		  var b = new Date(f.Y(), 6)
		  // Jul 1
		  // Jul 1 UTC
		  var d = Date.UTC(f.Y(), 6)
		  return ((a - c) !== (b - d)) ? 1 : 0
		},
		O: function () {
		  // Difference to GMT in hour format; e.g. +0200
		  var tzo = jsdate.getTimezoneOffset()
		  var a = Math.abs(tzo)
		  return (tzo > 0 ? '-' : '+') + _pad(Math.floor(a / 60) * 100 + a % 60, 4)
		},
		P: function () {
		  // Difference to GMT w/colon; e.g. +02:00
		  var O = f.O()
		  return (O.substr(0, 3) + ':' + O.substr(3, 2))
		},
		T: function () {
		  // The following works, but requires inclusion of the very
		  // large timezone_abbreviations_list() function.
		  /*              var abbr, i, os, _default;
		  if (!tal.length) {
			tal = that.timezone_abbreviations_list();
		  }
		  if ($locutus && $locutus.default_timezone) {
			_default = $locutus.default_timezone;
			for (abbr in tal) {
			  for (i = 0; i < tal[abbr].length; i++) {
				if (tal[abbr][i].timezone_id === _default) {
				  return abbr.toUpperCase();
				}
			  }
			}
		  }
		  for (abbr in tal) {
			for (i = 0; i < tal[abbr].length; i++) {
			  os = -jsdate.getTimezoneOffset() * 60;
			  if (tal[abbr][i].offset === os) {
				return abbr.toUpperCase();
			  }
			}
		  }
		  */
		  return 'UTC'
		},
		Z: function () {
		  // Timezone offset in seconds (-43200...50400)
		  return -jsdate.getTimezoneOffset() * 60
		},
		// Full Date/Time
		c: function () {
		  // ISO-8601 date.
		  return 'Y-m-d\\TH:i:sP'.replace(formatChr, formatChrCb)
		},
		r: function () {
		  // RFC 2822
		  return 'D, d M Y H:i:s O'.replace(formatChr, formatChrCb)
		},
		U: function () {
		  // Seconds since UNIX epoch
		  return jsdate / 1000 | 0
		}
	  }
	  var _date = function (format, timestamp) {
		jsdate = (timestamp === undefined ? new Date() // Not provided
		  : (timestamp instanceof Date) ? new Date(timestamp) // JS Date()
		  : new Date(timestamp * 1000) // UNIX timestamp (auto-convert to int)
		)
		return format.replace(formatChr, formatChrCb)
	  }
	  return _date(format, timestamp)
	}
	
    // 此处暴露方法

    window.date = date;
	if (typeof module !== 'undefined' && module.exports) {
		module.exports = date;
	}
  
}).call(this);